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A Heisman Trophy-winner who played for the University of Texas (go Longhorns!), Williams left the game during the height of his career to explore yoga and marijuana, among other things. He co-owns a restaurant in Miami that serves meat, but he makes sure that there are plenty of vegetarian-friendly options on the menu.

A shoe-in for the Hall of Fame, this Atlanta Falcons tight end was a dual-sports star at UC Berkeley, playing both basketball and football for the Golden Bears. He enjoys eating his vegetables to fuel his body and career.

Carl Lewis, the American Olympic track hero of the 1980s who was on a vegan diet while competing (also famous for his failed attempt at singing the national anthem), is now trying his hand in politics, gunning for a place in the New Jersey senate.

It seems like after his cameo in "The Hangover," Iron Mike, one of the most feared fighters in his generations, has taken on a warm and fuzzy persona that includes a shift to veganism for a healthier way of life. The pro boxer now has his own television show about his obsession with pigeons.

New York Jets hero Broadway Joe, also famous for being a playboy during the '60s and '70s, guaranteed a victory before the 1969 Super Bowl -- and delivered. You wouldn't think that this cocky former athlete would have experimented with vegetarianism as well.

New York's most recent sports celebrity after being traded to the Knicks from Denver a few months ago, Anthony turns vegetarian when he's on a diet. He's also husband to celebrity wife and former MTV VJ Lala.

Billie Jean King, along with Martina Navratilova, are two of the most celebrated women's tennis players of all time -- both are also known for their achievements in championing women's and gay/lesbian rights. They are also both long-time vegetarians.

A former Heisman Trophy-winner at Michigan and Super Bowl MVP for the Green Bay Packers, Howard now makes his living in television covering college football for ESPN (and makes sure to eat his greens).